I was able to do it when I was younger, like 18-25. Can't do it now.
Even when I was "able" to do it, it wasn't that pleasurable. The position was too unnatural for me, and it hurt to straighten up afterward. Sometimes I had to straighten gradually over several minutes.
I think I must have been much more horny back then because now I don't even understand the motivation of doing it the second-to-Nth times, but maybe I was hoping that it would become easier with practice.
